var randomnumber;
		var x;
		var books;
		
		books = 3;
		
		randomnumber = Math.floor(Math.random() * books);
		randomnumber = randomnumber + 1;
		
		switch(randomnumber)
			{
			case 1:
				document.write('<a href="http://www.ustrisports.com/" target="_blank"><img src="http://www.trifind.net/b/us-trisports/side.gif"');
				document.write(' border="0"');
				document.write(' alt="ustrisports.com"></a>');
				break;
			case 2:
				document.write('<a href="http://www.ustrisports.com/" target="_blank"><img src="http://www.trifind.net/b/us-trisports/side.gif"');
				document.write(' border="0"');
				document.write(' alt="ustrisports.com"></a>');
				break;
			case 3:
				document.write('<a href="http://www.ustrisports.com/" target="_blank"><img src="http://www.trifind.net/b/us-trisports/side.gif"');
				document.write(' border="0"');
				document.write(' alt="ustrisports.com"></a>');
				break;
			}